How severe is CVE-2018-15891?

CVE-2018-15891 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2018-15891 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-15891?

CVE-2018-15891 primarily affects Freepbx. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2018-15891?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2018-15891 published?

CVE-2018-15891 was published on 2019-06-20 and last updated on 2026-06-17.

CVE-2018-15891

CVE-2018-15891 is a medium-severity vulnerability in Freepbx with a CVSS 3.x base score of 4.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 4.8)
CVSS v2: 3.5
EPSS exploit prediction: 1% (43rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Freepbx
Published: 2019-06-20
Last modified: 2026-06-17

Description

An issue was discovered in FreePBX core before 3.0.122.43, 14.0.18.34, and 5.0.1beta4. By crafting a request for adding Asterisk modules, an attacker is able to store JavaScript commands in a module name.

Frequently asked questions

What is CVE-2018-15891?: An issue was discovered in FreePBX core before 3.0.122.43, 14.0.18.34, and 5.0.1beta4. By crafting a request for adding Asterisk modules, an attacker is able to store JavaScript commands in a module name.
How severe is CVE-2018-15891?: CVE-2018-15891 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2018-15891 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-15891?: CVE-2018-15891 primarily affects Freepbx. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2018-15891?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2018-15891 published?: CVE-2018-15891 was published on 2019-06-20 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:freepbx:freepbx:15.0.1:-:*:*:*:*:*:*
cpe:2.3:a:sangoma:freepbx:*:*:*:*:*:*:*:*
cpe:2.3:a:sangoma:freepbx:15.0.1:beta4:*:*:*:*:*:*

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